Liang Li <liliang.opensource@xxxxxxxxx> writes: > The first version can be found at: https://lkml.org/lkml/2020/4/12/42 > > Zero out the page content usually happens when allocating pages with > the flag of __GFP_ZERO, this is a time consuming operation, it makes > the population of a large vma area very slowly. This patch introduce > a new feature for zero out pages before page allocation, it can help > to speed up page allocation with __GFP_ZERO. kzeropaged appears to escape some of the kernel's resource controls, at least if I'm understanding this right. The heavy part of a page fault is moved out of the faulting task's context so the CPU controller can't throttle it. A task that uses these pages can benefit from clearing done by CPUs that it's not allowed to run on. How can it handle these cases?
